Cervix Tracker (due 20th or 21st May)

✨Stephanie✨ • Waiting for His big blessings. Positive vibes🍀💕✨
I've been tracking my cervix for 1.5 month. It all began with curiosity, and eventually I learned about the height, firmness, wetness, but still confused with open or closed. Due today and I tested today, 2 bfn. However my cervix isn't as hard as an unriped fruit like it was previous cycle (low, freaking hard, and cm has tinged of brown or old blood). 
Today morning: cervix extremely high but reachable, med soft? But softer than last cycle. Creamy cm.
Last night: medium height, medium soft, stretchy creamy cm.
Now all I want is AF not to be more than 2 day late or don't show up at all and give me a frigging positive in a week. Ugh. PMS is not so common for me after I started active lifestyle a year ago.
Do you track your cervix? How can you personally tell difference when your AF is coming through cervix checking?
Any info would be appreciated. Thanks for reading this long thread :)